Add AutoClosable interface to MutableBytes to use with try-with-resource

[patrickfav]

The idea is to use it with self-wiping properties in security envirnoment, like:

try (MutableBytes b = Bytes.wrap(new byte[16]).mutable()) {
        assertArrayEquals(new byte[16], b.array());
        SecretKey s = new SecretKeySpec(b.array(), "AES");

}

The close logic should then invoke secureWipe()

[patrickfav]

close by 737044a